Heap buffer overflow in CefSharp
CISA confirms exploitation of this vulnerability in real attacks. Prioritise checking whether your application is affected. CISA KEV · CC0 1.0
Impact
A memory corruption bug(Heap overflow) in the FreeType font rendering library.
This can be exploited by attackers to execute arbitrary code by using specially crafted fonts with embedded PNG images .
As per https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/
Google is aware of reports that an exploit for CVE-2020-15999 exists in the wild.
Patches
Upgrade to 85.3.130 or higher
References
- https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/
- https://www.zdnet.com/article/google-releases-chrome-security-update-to-patch-actively-exploited-zero-day/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15999
- https://magpcss.org/ceforum/viewtopic.php?f=10&t=17942
To review the CEF/Chromium patch see https://bitbucket.org/chromiumembedded/cef/commits/cd6cbe008b127990036945fb75e7c2c1594ab10d
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | CefSharp.Common | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.WinForms | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.Wpf | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.Wpf.HwndHost | < 85.3.130 | 85.3.130 |
References
- https://github.com/cefsharp/CefSharp/security/advisories/GHSA-pv36-h7jh-qm62
- https://nvd.nist.gov/vuln/detail/CVE-2020-15999
- https://www.nuget.org/packages/CefSharp.Wpf.HwndHost
- https://www.nuget.org/packages/CefSharp.Wpf
- https://www.nuget.org/packages/CefSharp.WinForms
- https://www.nuget.org/packages/CefSharp.Common
- https://www.debian.org/security/2021/dsa-4824
- https://security.netapp.com/advisory/ntap-20240812-0001
- https://security.gentoo.org/glsa/202401-19
- https://security.gentoo.org/glsa/202012-04
- https://security.gentoo.org/glsa/202011-12
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7
- https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html
- https://github.com/cefsharp/CefSharp
- https://crbug.com/1139963
- https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.html
- http://seclists.org/fulldisclosure/2020/Nov/33
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-119, CWE-787- Platform
- .NET (NuGet)
- Package
CefSharp.Common, CefSharp.WinForms, CefSharp.Wpf- Disclosed
- 27.10.2020
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pv36-h7jh-qm62 - CC BY 4.0
Vulnerability history: CefSharp.Common
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 10.2020 06.2026
- Without a fix
- 0
- Exploited in attacks
- 5
Severity breakdown
- Critical 1
- High 5
- Medium 2
Disclosures per year
- 2020: 4
- 2021: 0
- 2022: 1
- 2023: 2
- 2024: 0
- 2025: 0
- 2026: 1
-
Heap buffer overflow in CefSharp this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.